Tool holder



FIG. 1 is an enlarged perspective view of a tool holder showing my new design;

FIG. 2 is a side elevational view taken from the left of FIG. 1, the side opposite being a mirror image thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view thereof. 

The ornamental design for a tool holder, as shown and described. 